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Quick answer
Portable LPG cabinet heaters are flueless, so all their combustion products, including water vapour and a small amount of carbon monoxide, go straight into the room. They can be used safely in the right circumstances, but they need good ventilation, should never be used in bedrooms, bathrooms or small enclosed spaces, and must not be used or stored below ground level, because LPG is heavier than air. Have a working carbon monoxide alarm in any room where one is used, and have the heater checked by a Gas Safe engineer qualified for LPG.
Key takeaways
- Cabinet heaters are flueless: combustion products stay in the room.
- They produce large amounts of water vapour, which causes condensation and damp.
- Never use them in bedrooms, bathrooms or small unventilated rooms.
- LPG is heavier than air, so cylinders must not be used or stored in cellars or basements.
- A carbon monoxide alarm and regular safety checks are essential.
How cabinet heaters work
A cabinet heater burns LPG (usually butane) from a cylinder inside the unit. Most have an oxygen depletion sensor that shuts the heater down if oxygen levels in the room fall. That is an important safety feature, but it is not a substitute for ventilation or a CO alarm.
Ventilation
Because they are flueless, cabinet heaters need a supply of fresh air. Follow the manufacturer’s ventilation guidance and never block air bricks or vents to keep the room warmer. Keep a window slightly open where recommended.
Condensation and damp
Burning butane produces water vapour. A cabinet heater running for hours can add a surprising amount of moisture to a room, leading to condensation on windows and walls and, over time, mould. See damp and condensation indoors.
Where not to use them
- Bedrooms, bathrooms and shower rooms.
- Small rooms, caravans or enclosed spaces without adequate ventilation.
- Cellars and basements: LPG is heavier than air and can collect at low level.
- Near curtains, furniture or drying clothes.
Carbon monoxide
Even a well-maintained flueless heater produces some combustion products. A faulty one can produce dangerous levels of CO. Fit an audible CO alarm. See carbon monoxide alarms and your boiler and CO symptoms.
Landlords and tenants
Many tenancy agreements prohibit portable gas heaters because of damp and safety concerns. Landlords are not responsible for tenant-owned heaters but should make their position clear. See tenant-owned gas appliances.
Cost
Bottled LPG is generally more expensive per unit of heat than mains gas through a boiler. A cabinet heater may be useful as a short-term backup, but is rarely the cheapest way to heat a home. See electric heater vs gas central heating.
Book with Gasmaster
Relying on a portable heater because the boiler is down? Gasmaster Plumbing & Heating, Gas Safe registered (220932), can get your heating working across Stoke-on-Trent, Newcastle-under-Lyme and Biddulph. See our emergency boiler repair service.
Frequently asked questions
Is it safe to use a gas heater indoors?
A well-maintained cabinet heater can be used in a well-ventilated living area with a CO alarm, following the manufacturer’s instructions. It is not suitable for every room.
Can I use a gas heater in a bedroom?
No. Flueless gas heaters should not be used in bedrooms.
Do cabinet heaters need servicing?
Yes. Have them checked by a Gas Safe engineer qualified to work on LPG appliances.
Sources
- Gas Safe Register, LPG safety advice (gassaferegister.co.uk)
- Health and Safety Executive, LPG guidance (hse.gov.uk)
- Liquid Gas UK, consumer safety guidance (liquidgasuk.org)
Related services
Abdul runs Gasmaster Plumbing & Heating and has worked on boilers, heating and gas appliances across Stoke-on-Trent since 2005. He is Gas Safe registered (reg. 220932), and these articles come from his day to day work in homes and businesses across Staffordshire, Cheshire and Derbyshire.
